Major Carcass Parts of Broiler Chicken from Different Genotype, Sex, Age and Nutrition System

The aim of this paper was to examine the influence of sex, age and nutrition system on mass and yield of major parts in broiler chicken carcass from different genotypes. Research material was one-day chicken of Hubbard Classic and Cobb 500 genotypes fattened 49 days in production conditions. The chicken used two nutrition systems. The first nutrition system had higher level of energy and E : P ratio, while the second had higher level of proteins and lower values of E : P ratio in all phase of nutrition. Chicken were separated by sex, and by method of random selection were selected and slaughtered 40 male and 40 female chicken (total 240) in 35t, 42 and 49 day of age. Major parts of carcass (breasts, thighs and drumsticks) were separated and was calculated their mass, yield and variance. The computer program STATISTICA 6 statistically processed all dates. Differences in mass and yield of breasts, thighs and drumstick were statistically significant (P<0.05) at chicken with different age. The chicken at 49t day of age had significantly higher mass of major carcass parts than the chicks at 42 and 35 day of age. Genotype had influence only on yield of breasts, namely chickens of Cobb 500 genotype had significant (P<0.05) bigger yield of breast then chickens of Hubbard genotype. The male chickens had statistically significant (P<0.05) bigger main parts mass of carcass and bigger thighs yield then female chickens. The nutrition system basically had not effect on major edible parts of carcass, except on thighs yield, which were significantly (P<0.05) bigger at chicken that have used mixtures with higher level of proteins and lower values of E : P ratio.